Bump alpine from 3.20 to 3.21 in /test/Renci.SshNet.IntegrationTests#1567

Rob-Hague merged 3 commits intodevelopsshnet/SSH.NET:developfrom

dependabot/docker/test/Renci.SshNet.IntegrationTests/alpine-3.21sshnet/SSH.NET:dependabot/docker/test/Renci.SshNet.IntegrationTests/alpine-3.21Copy head branch name to clipboard